Electromyography (EMG)/Nerve Conduction Study
Electromyograms (EMG) and nerve conduction studies (NCS) play a vital role in evaluating and diagnosing nerve and muscle conditions. Generally performed together, this two-part study provides a precise and detailed assessment of how well your nerves and muscles are working together to control movement and respond to your body signals.
Combined with a clinical examination, this information will help your physician diagnose your condition and determine whether medical or surgical treatment is necessary. Studies may also be performed to monitor recovery or track the progression of a condition.
The information provided by EMG and NCS testing helps doctors pinpoint problems quickly and accurately, improving care and supporting faster recovery for patients, according to the American Association of Neuromuscular and Electrodiagnostic Medicine (AANEM).
Electromyogram (EMG)
An EMG evaluates the health of muscles and nerve cells called motor neurons that control them. These nerve cells send electrical signals to your muscles, causing them to contract.
How it works
During the test, a specially trained clinician places a tiny needle electrode into your muscle. Electrical activity is recorded while the muscle is still and while it is moving. This information helps identify injuries or abnormalities related to muscles and nerves.
Nerve conduction study (NCS)
Healthy nerves send electrical signals called impulses to move muscles, but when nerves are damaged, they can cause tingling, numbness, pain, and problems with muscle movement. Conduction studies gauge how well a nerve is doing its job by targeting the nerve with low-level electrical pulses and measuring the muscle's reaction.
How it works
A small, surface electrode is placed on your skin above the nerve, and another is positioned above the muscle controlled by that nerve. The electrodes send low-level electrical impulses, stimulating the nerve to measure its function. The speed, strength, and timing of the nerve responses are recorded.
